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### Factors for Converting Units of Area

This page gives conversion factors which can be used to interchange various units of area. Also some units used in older publications.

The calculator below can be dragged around with your mouse for working out the conversion.
Use these links to other pages of conversion factors.
 Calculator floats on page drag and operate with mouse. One operation at a time, for chain calculations clear result and re-enter for next stage.

### Useful Area Reationships

1 English Statute or Imperial acre = 1 furlong (furrow long) x 1 chain (22 yards) = 4,840 square yards.

One acre was about the area that a man with a team of horses could plough in a day. Also when estimating the amount of work to be done a man could pace out a small area, then multiply up to tell how long a job would take and how much it would cost, eg. 22 yards make a chain and there are 10 square chains in an acre, so by pacing out a patch of ground a rough estimate of its size can be obtained.
But not all acres are the same, with some countries having different sizes.
1 Scottish acre = 6,104.128 square yards (1 Scottish = 1.261 Imperial).
1 Irish acre = 7,840.8 square yards (1 Irish = 1.62 Imperial).

1 rood = 40 square poles = 1210 sq yds
4 roods = 1 acre
10 square chains = 1 acre.
540 acres = 1 square mile
1 square pole = 1 square rod = 1 square perch = 1/160th of an acre = 30.25 sq yds = 272 ¼ sq feet
(A square rod was used to measure brickwork and masonry. A rod is 5½ yards long and not a misspelling of a rood.)
1 acre = 4,046.9 square metres
1 hectare = 2.4711 acres
1 hectare = 10,000 square metres
1 square mile = 259.0 hectares
1 square kilometre = 0.3861 square miles

Important note:
When quoting area in any form it should be noted that a "square unit" is only equal to a "unit square(d)" when the value is one.
ie. one square metre equals one metre square, but two square metres do not equal two metres square.

two square metres (2m2) =  approx 1.4142m x 1.4142m or any other shape,
whereas two metres square is an area 2m x 2m  =  4m2.

### Area Conversion Factors

 from to multiply by square inches (in2) square millimetres (mm2) 645.16 square inches square centimetres 6.4516 square centimetres (cm2) square inches 0.155 square feet (ft2) square centimetres 929.03 square feet square metres 0.0929 square metres(m2) square feet 10.764 square yards(yd2) square metres 0.83612 square metres square yards 1.196 square miles square kilometres 2.5899 square kilometres square miles 0.386 square miles hectares 258.999 acres square metres 4046.86 acres hectares 0.40468 hectares acres 2.471 hectares square metres 10,000 hectares square kilometres 0.01 hectares square yards 11,960

### Imperial to Metric Area Equivalences

 yd2 = m2 m2 = yd2 1 = 0.8 1 = 1.2 2 = 1.7 2 = 2.4 3 = 2.51 3 = 3.6 4 = 3.34 4 = 4.8 5 = 4.2 5 = 6.0 6 = 5.0 6 = 7.2 7 = 5.85 7 = 8.4 8 = 6.7 8 = 9.6 9 = 7.52 9 = 10.76 10 = 8.4 10 = 12 15 = 12.54 15 = 18 20 = 16.7 20 = 24

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